Modelling and Development of A Frequency Modulated Field Strength Indicator

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Publication Details

Subtitle: Modelling and Development of A Frequency Modulated Field Strength Indicator

Publisher: American Institute of Steel Construction, Inc.

Publication year: 2014

Volume number: 1

Issue number: 4

Start page: 192

End page: 205

Number of pages: 14

ISSN: 0013-8029

URL: http://www.rspublication.com/ijeted/2014/jan14/19.pdf

Languages: English-United States (EN-US)

Abstract

Measuring instruments are inevitable in the world of Science and Engineering. Most often than not Field Strength Indicator (FSI) equipment are imported at a veryexpensive rate giving the economic situation currently in the developing county like Malaysia. Therefore, an inexpensive and reliable method of ascertaining the desired result becomes the motivating factor, coupled with the challenge of translating theoryinto concrete terms hence serving the needs of humanity. The FM Field strength meter (FSM) otherwise known as radiation tester, is a special receiver designed to measure the field strength of an electromagnetic wave (EM Wave) radiated by any transmitter transmitting in the same frequency ranges, and displaying either on a calibrated scale or LED readout. The concept of frequency tuning using resonance LC circuit is employedto receive signals while the other sub-circuits are used to filter out the RF signals from the received signal to have only an FM signal. This FM signal is then amplified anddisplayed on the LED readout. At the end of the design and development of the system,the performance objective that is basically to detect an appropriate level of signal within the range of frequency specified for the operation of the FSI was achieved.

Keywords

Frequency Modulation, Field Strength, Received Signal Strength, Indicators, Electromagnetic Waves

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